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Geographic and Product Data (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Product Information [Line Items]
Net sales	$ 90,611	$ 82,432	$ 77,123
ICLs [Member]
Product Information [Line Items]
Net sales	68,325	59,111	51,543
IOLs [Member]
Product Information [Line Items]
Net sales	17,258	19,706	19,857
Other surgical products [Member]
Product Information [Line Items]
Net sales	$ 5,028	$ 3,615	$ 5,723

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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